Well, we aren't allowed to link Tumblrs, so I'll have to tell you the person's url.

I think the best user for any QR code is merongcrossing. Search for her on Tumblr. She has everything neatly layed out in a way which is very organized. In her description box, you will see that she has "PATHS" as the last link. Click on that and it will take you to a lot of different pages full of QR Codes for path patterns specifically.